Peeing when you are excited is not the same as submissive urination.

I know that in puppies and females they don't have as much control over their bladder, so when they get overly excited some can pee or dribble. Sometimes its a medical condition though, like I know this isn't a dog but my youngest sister had problems when she was REALLY young with bladder control. They had to put her on Ditropan to help control the muscle.

How old is Sammy again??